JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year MINERAL PROCESSING Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks.
Part A
Define gape, set and throw in jaw crushers.
Answer
- Gape: The maximum distance between the crushing jaws at the feed opening, which determines the maximum size of the feed material that can enter the crusher.
- Set: The minimum distance between the crushing jaws at the discharge point, which determines the maximum size of the product produced.
- Throw: The total distance the moving jaw travels during one complete cycle of operation, which influences the throughput capacity and the crushing force.
What are the objectives of grinding?
Answer
- Liberation: To physically detach valuable mineral grains from the gangue matrix.
- Size Reduction: To reduce the ore to a size suitable for downstream concentration processes like flotation or leaching.
- Surface Area Increase: To increase the specific surface area of the mineral particles to enhance chemical reactivity in hydrometallurgical extraction.
What is ratio of concentration?
Answer
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What are the conditions required for efficient classification?
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What are the factors that affect the rate of setting of particles on an inclined deck?
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What is the importance of partition curves in heavy media separation?
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What do you mean by float and sink operation?
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What are the different methods of demagnetization?
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What are flotation reagents?
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What are Xanthates? Give their names and chemical formulae.
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Part B
What is angle of nip? Derive the formula for angle of nip.
Answer
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Discuss about the factors affecting capacity of roll crushers.
Answer
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Describe liberation by detachment.
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Describe the methods of determination of degree of liberation.
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Discuss about the graphical methods of representation of sizing data.
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What are free settling and hindered settling conditions?
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What is classification? Discuss about the correction factor to Stoke’s law for solid – liquid ratio applied in classifiers.
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Compare and contrast heavy media separation and heavy suspension separation. Give suitable examples for each one of them.
Answer
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With the help of a neat sketch, explain the working of a dielectric separation process.
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Describe the various types of Jigging Cycles.
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Explain the mechanism of stratification in a Jigging process.
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Explain the factors that affect the mineral behavior in tabling operation.
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How the collectors are classified? Explain the mechanism of collectors.
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Write short notes on the following:
- Factors affecting flotation
- Bubble attachment to mineral particles.
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